Spring washer for coaster brakes



Patented Sept. 7.1, 1923..

"1 TTE man AUGU ST 3'. L'IOTTLAU, OF.PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T 0 121, MECKY COMEANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF "EENNSYL- ynnrn.

SPRING- WASHER F01 3 COASTEE BRAKES;

Application filed February 17, 1922. Serial No. 537,292.

T 0 all whom it may concern:

Be it known that I, AUGUsT J. MOTTLAU,

a subject of the King of Denmark, residing in Philadelphia,county of Philadelphia, and State of Pennsylvania, have. invented certain new and useful Improvements in Spring lVashers for Coaster Brakes, of which, the followingis a specification. 1 3

This-invention relates. to coaster brakes for velocipedes though it is noted that the invention is not limited to velocipedes nor even in some respects to vehicles or brakes.

The invention relates particularly to improvements in the coaster brake shown in.

tain said shoes in engagement withthe spindles. The wheel hub encloses the brake shoes; and clutching rollers disposed in longitudlnal recesses of the brake shoes and operative between the hub and the brake shoes for operatively connecting them, are held against endwise movement. by said spring.

One object of the invention is to provide an arrangement and device for this kind of brake whereby said end groove and split spring may be done away with, and a more easily 7 manufactured spring washer substituted, thus also doing away with the machine work. I I

' Another object of .the inventionis to provide a device similar to that .of Fig. 5 f

said patent in which coasting ball bearings are substituted for the plain bearings of said figure. 7

Other objects of the invention are'to improve generally the simplicity and efliciency of such apparatus and to provide an apparatus of this kind which,is.durable,eco

minute deta l o t e in entio are 1?"- scribed, the inventionis not limited to these, since many andvarious changes may be made without departing from the scope of the invention as claimed. c

In the accompanying drawing, showing by way ofexample two of many possible embodiments of the invention,

.Fig. 1 is a longitudinalivertical. section showing my invention as applied to the driving wheel of a velocipede;

Figs-2 and 3 are transverse vertical sections taken respectively on the lines 2-2 and 3-3 ofFig. 1, Fig. 2 showing the parts in the positions occupied when power is,

being transmitted to drive the wheel;

Fig. 41 is an-inner side elevation of the spring washer; and s Fig. 5 is a fragmental longitudinal section of a modified form of my invention.

The improved coaster brake is shown in combination with the prongs or branches 10 of the fork of a velocipede,'said branches having annular end portions 11 in which are mounted ball bearings '12 for the reception of the cylindrical portions 13 of the tubular spindles 1 1, which have their outer ends integral with pedal cranks 15. Said tubular spindles are connected and held in place by a bolt '16, extending longitudinally through them and through the cranks 15, said bolt having on its opposite ends nuts 17 and 18, although obviously it may be otherwise constructed.

The inner ends 19 of the crank spindles are externally squared and serve to support convenient number of segmental shoes 20, in the present instance four, whose outer surfaces are cylindrically curved to fit withinand substantially fill the cylindrical hub sleeve 21 of the velocipede. wheel, of which only said sleeve 21, the end flanges 22 and parts of the spokes 23 are shown.

In the present instance the shoes 20 have radially disposed. engaging faces 24 (Fig. 2): and also flat faces 25 for engagement with the fiat sides of the square ends 19 of the crank spindles. Each of the shoes 20 is preferably formed with a longitudinally extending recess 29 in its .cylindrically curved face for the reception of a clutch roller 30. The bottoms of these recesses are, in the present instance provided with a wear plate.

31 on'which said roller rests, and are in.- clined at an acute angle to the adjaceut'im ner surface of the hub sleeve, so that when the shoes are turned in the forward direction all of the rollers are causedto frictionally engage with the hub sleevej The wear plates may be omitted if desired. 7

WVithin' each end of the'hub sleeve 21, a cylindrical cup-shaped bearing -member or piece 33 is mounted on the squared portion 19 of the crank spindle and holds the sleeve out of coasting contact with the shoes 20. The end wall 34; of the member 33 is shown engaging against the cylindrical portion13, though the bearing member 33 could be re versed if desired.v This part of the portion 19 may be squared or cylindrical desired. Betweensaid members 33 I mount the shoes 20. The opposite ends of theshoes are true planes at right angles to the axes against the bottom of the recesses 29 to hold against the bottom ofthe recess 29.

the shoes 20 yieldably inwardly against the squared portionslt l. v v

lvVhen viewed from the inner ends-(Fig. 3) and in mid-section-(Fig, 3), the fingers 38 show a flattened V shape having inner side faces '39, one of 'which engages flat y havingthe fingers thus-{ofV-shaped crosssection, one flat'face 39 will always ens grage'flat against thejbottoin of the recess '29 whether the spring washer is at the left or right end of-the hub sleeve. Thus the necessity and expense of making separate right and left washers is obviated. v

-The'extreme free ends 40 (Fig. 1) ofthe fingers 38 is' turned-away and spacec'l from the bottom of the recess, and thus en gage the ends of the rollersEOtdprevent their longitudinal movement from the trecesses 29.

"lVhile it is true the various parts are so assembled that the crank spindles are kept from longitudinal movement on the bolt 16, they may none the less be independently i turned thereon to a limite dextent.

tached thereto'may thus be turned and the V If the cranks 15' be turned in a counterclockwise direction, as indicated by thearrow in Fig. 2,'tlie shoes 20 on. the squared ends 19 of the spiiidles 14 are'necessarily turned withtheni and at once oneler more er the rollers 80 engage with the sleeve 21 1 with a wedging action'andact' to" frictionally connect'saidshoes ,to the hub sleeve 21, thus the sleeve: 21 with the wheel at.-

' vehicle driven in aforward direction] If the force applied to rotate the cranks 15 be removed, the Wheel is free to turn thereb 'permittin the vehicle to. o ilst. If

new one of the pedals be angularlyT'rotated relatively to the other, as would occur for example if the pedals were pressed in opposite directions or if one of them was held and the other pressed backward-1y, thereis a relative angular displacement of the squared ends 19' of thetubular crank spindles, which forces outwardly the shoes 20 and causes them to exert africtional brain ing or retarding force on the rotationof the hub sleeve'nl; lheforward rotationof the wheel, "and forward'inotion ofxthe vehicle are thus retarded; this'bra king action may be stopped byagain allowing the pedals; and hence the shoes 20 to resume their normal positions under the action of the fingers 38; Instead of} the cup-shaped m n-b er 33,1

may'employ other shapes having suitable bearing surface in engagement withthe-hub' sleeve '21, "orthe portion 19 (if rounded where'engaged by the" member 33) ;or I may use the set 'of balls'bearinggenerally indicated by reference numeral 33 of Fig. 5. In the latter case, the wheel coasts on the ball bearings 1 i i i In both of thehereindescribed forms of my invention it is partieularly to be noted that" the various parts are of durable and substantial construction and are capable of bemg easily and quickly assembled, while the device as a whole may be made with a minimum cost. At the same time the construction is simple and certain in its action and. of such a nature that underv conditions of use there is but littlelikelihood of-its getting'out of repair-or requiring attention.

" is mv In. combination, brake shoes; a sleeve enclosing saidbrake shoes meansjfor mov ing the shoes'into braking c'ontacti withthe sleeves; and spring means'having fingers for holding the shoes against braking move ment. V we V 2. In combination, rotatable drive members; brake shoes separable by relative rotation of thedrive'members and rotatable by rotation of" the drive members; a sleeve enclosing said brake shoes; and spring washers having in-turned fingers yieldably holding said 7 shoes against separation.

In combinati on, rotatable anve hers; brake shoes separable by-relativerotation of the drive members and rotatableby rotation of thedr'ivelmembers inxthe same direction,and provided inftheir outer faces with recesses;havmgunohned bottoms; .a r

sleeve enclosing *saidfbrake "shoes; clutch means in said recesses; and spring washers respectively at opposite ends of the brake shoes and each having an opening receiving one of the drive members, and having inturned fingers disposed in the respective recesses.

a. In combination, rotatable drive members; shoes separable by movement of the drive members and rotatable by the drive members and provided with longitudinal recesses having inclined bottoms; a sleeve enclosing said brake shoes; and spring washers having in-turned fingers disposed in the re spective recesses and having'intermediat-e contact portion having'an inclined face disposed against said bottom wall.

5. In combination, rotatable drive members; shoes separable by 'movement of the drive members and rotatable by the driv members and provided with longitudinal recesses having inclined bottoms; a sleeve enclosing saidbicake shoes; clutch rollers in said recesses; and spring washers having inturned fingers disposed in the respective recesses and having intermediate contact p61:

tions of ii-shaped cross-section, said portion having its ridge and one facedisposed against said bottom wall.

6JThe combination of cranks having spindles formed with portions of other than circular section; relatively rotatable brake shoes mounted on said portions of the spindles and provided in their outer surfaces with longitudinally extending recesses having; forwardly inwardly inclined bottom walls; a sleeve enclosing said brakeshoes; and rollers in said recesses ter ninating short of the ends of the recesses for clutching the shoes to the sleeve when they are turned in forward direction; and spring washers. respectively disposed against the opposite ends of the brake shoes and each having an opening receiving the spindle, and in-turned fingers disposed in the respective recesses and limiting longitudinal movementof the rollers and having intermediate contact portions of V-shaped crosssection, said portionhaving its ridge sides and one face disposed against said bottom Wall. I

7. In combination, rotatable drive members having spindles; relatively rotatable brake shoes mounted on said spindles separable by relative rotation of the drive members and rotatable by rotation of the drive members in the same direction and provided in their outer faces with longitudinally "extending recesses having inclined bottoms; a sleeve enclosing said brake shoes; rollers in said recesses for clutching the shoes to the sleeve when they are turned in forward direction; bearing members carried on said spindlesand holding the sleeve out of contact with the shoes when the sleeve rotates relative to'the shoes; and spring washers respectively disposed against the opposite ends 7 carrying member driven by the drive means and provided with a recess having an inclined bottom; a wear plate disposedagainst said bottom; a driven member; and a clutch roller in said recess and bearing against the wear plate and adapted to clutch the driven member. '1 I r i .9. In combination rotatable drive members; brake shoes rotatable by the drive members and provided in their outer faces with longitudinally extending recesses having inclined bottoms; a wear plate disposed against the bottom of each recess; a sleeve enclosing said shoes; and rollers in said recesses' and bearing against each wear plate for clutching the sleeve.

10. In combination rotatable drive menr bers having spindles; relatively; movable brake shoes mounted. on said spindles, sep arable by relative rotation of the drive mem bers and rotatable by the drive members where the drive members are rotated in'the same direction, said shoesbeing provided in their outer faces with longitudinally extending recesses having inclined bottoms; a

wear plate disposed against the bottom of each recess; a sleeve enclosing said. brake shoes; and rollers in said recessesand bearing against each wear plate for clutching the shoes to the sleeve when they are turnedin forward direction,

11.111 combination; rotatable drive mem bers having spindles; brake shoes mounted on said spindles and separable by relative movement of the drive members and rotatable by'the drive members and provided in their outer faces with longitudinally extending recesses having inclined bottoms; a sleeve enclosing said brake shoes; rollers in said recesses for clutching the shoes to the sleeve when they are turned in forward direction; and bearing members carried on said spindles and holding the sleeve out of contact with the shoes when the sleeve rotates relative to the shoes.

12. In combination, rotary driving menr bers; a driven member; means interposed between said driving and driven members for driving the driven member when the driving members'are turned in one direction; and bearing members for holding the driven member out of supporting contact with said means when the driven member rotates relative to the drive members.

13. In combination,rotary'driving mem:

bers; clutch carrying members rotatable by;

"the driving members; a driven member;

clutch meansinterposed between-said carrying members and driven member for driving the driven member when the drive members are turned in one direction; and bearing 7 members carried on said driving members and forming bearing support for the driven member when the driven member rotates relative to the drive members.

14:. In combination, co-axial rotary driving'membersadapted for concurrent or relative movement or rest;brake members susceptiolc to braking-movoment by relative movement of said driving members, and rotatable by movement of the driving members in the same direction; a driven member engageableby said brakemembers by said braking movement; clutch means interposed between said brake members and driven member for driving the driven member when the brake members are. rotated in one direction; and bearing members carried on said driving members and tormmg bearing support for the driven member for holding the driven member out of contact with the brake members when the driven member rotates'relative to the drive members.

15. In eombination; co-aXial rotary driving members adapted for concurrent or relative movement or rest; brake members relatively movable from each other by relative movement of said driving members; and ro-- 1 tatable by concurrent movement of the driving members; a driven member enclosing,

said brake members; clutch means interposed ;between ,said brake members and driven member for clutching the brake members to the driven member when the brake meters members are turned in one direction; and

bearing memberscarried on said driving members and, iormmg'bearingv support for the driven 'member for holding the driven member out of contact with the brake memhere when the driven member rotates relative to the drive members. j a

16. The combination of cranks having spindles formed with portions of other than circular section;-relatively rotatable brake dles and provided in-their outer faces with longitudinally extending recesses having forwardly inwardly'in elined bottom walls; a sleeve enclosing said brake shoes; and rollers in said'recesses for clut'chinglthe shoes to the sleeve Whenthey are turned" in forward direction; and cup-shaped bear-ingf membersca-rried on said-spindles andform ing' bearing support for the sleeve when the sleeve rotates relative to the shoes.

17. The combination of cranks having spindles formed with portionsof other than circular section; relatively rotatable brake shoes mounted on said portions otthe spindles and provided in their outer faces with longitudinally extending recesses having forwardly inwardly inclined bottom Walls;

shoes mounted on said portions, of the spina sleeve enclosing said brake shoes; rollers in said recesses for clutching the shoes to the sleeve when they are turned intorward die AUGUST JQMOTT U- 

